The act of browsing charity shops one after another for a sustained length of time, possibly following a pre-planned route. An all round good day out.
Interesting person A: What's our plans for saturday then?
Interesting person B: How about we go in to town, you know, do a bi' o' chazzing...
Interesting person A: Great, I'm well up for that
Interesting person B: Sorted. See you at 9.30 sharp in Oxfam.